I'm trying to link https://ast.wiktionary.org/wiki/Wikcionariu:Alministradores to https://www.wikidata.org/wiki/Q4039395 using the link in the ast.wiktionary sidebar, but it won't let me and repeatedly fails with Uncaught TypeError: $(...).siteselector(...).getId is not a function. See P16260.
I've reset my local preferences and tried again (sometimes ULS errors got fixed by resetting your preferences) but it didn't work.
Given that I am not sure which specific component is triggering this error, I'm adding the tags of those that I think might be the cause.
(Note: I've tried to do this both with ?debug=true and &safemode=1 but I'm still unable to add the link).
The dialogue window that ought to display linked pages is likewise displayed empty: